[WIP] Major 5 manifest

[3y3]

Improve plugins functionality

• Implement async transform API (3y3)
• Add deprecation warning for sync transform API (3y3)

Reduce package build size

• Extract liquid to @diplodoc/md-liquid package (3y3)
• Add deprecation warning for liquid usage from current package (3y3)
• Allow to replace liquid implementation in transformer (3y3)
• Extract lint to @diplodoc/md-lint package (3y3)
• Add deprecation warning for lint usage from current package (3y3)
• Reimplement highlighte.js connection (?)

Syntax

• ? Add sup by default
• ? Add underline by default
• ? Add task list by default

API

• ? Migrate to ESM with cjs compatibility
• Limit exported API by package.exports

[ogonkov]

Can we move highlight.js initialization outside of markdown transformation?

To be able load it asynchronously for example

import t from '@diplodoc/transform';

import('highlight.js').then((highlightJsFn) => t(content, {highlight: highlightJsFn}))

[ogonkov]

Transform has some weak typings, for example in options, that allows any key

transform/src/transform/typings.ts

Line 61 in 357ad7c

[x: string]: unknown;

That would be great to replace it with generic, to force people correctly type their options

[shevnv]

Syntax

• ? add color text plugin, maybe by default markdown-it-color
• ? mark text plugin by default markdown-it-mark
• ? add iframe plugin

[d3m1d0v]

Let's remove re-exports of extensions:

• remove re-export of cut-extension
• remove re-export of tabs-extension